Wokwi - Online ESP32, STM32, Arduino Simulator

/*
AT
AT+CWMODE=1
AT+CWLAP
AT+CWJAP="Wokwi-GUEST",
AT+CIFSR
AT+CIPMUX=1
AT+CIPSERVER=1,80
*/

#include <SoftwareSerial.h>

#define DEBUG true

//RX pino 2, TX pino 3
/*
 * Adaptador      Arduino
 *    RX      ->   3(TX)
 *    TX      ->   2(RX)
 */

SoftwareSerial esp8266(2, 3);

void setup() {

  // initialize serial for debugging
  Serial.begin(9600);
  
  // initialize serial for ESP module
  esp8266.begin(115200);

  Serial.println("** Verificando conexao **");
  Serial.println();
  delay(1000);

  // Reinicializar parametros ...
  sendData("AT\r\n", 2000, DEBUG); // rst
  delay(1000);
  
  // Ativar mode de operação para estação ...
  sendData("AT+CWMODE=1\r\n", 1000, DEBUG);
  delay(1000);

  // Conectar a rede wireless ...
  sendData("AT+CWJAP=\"Wokwi-GUEST\",\r\n", 2000, DEBUG);
  delay(3000);

  // Mostrar o endereco IP ...
  sendData("AT+CIFSR\r\n", 1000, DEBUG);
  delay(1000);

  // Configurar para multiplas conexoes
  sendData("AT+CIPMUX=1\r\n", 1000, DEBUG);

  // Iniciar o web server na porta 80
  sendData("AT+CIPSERVER=1,80\r\n", 1000, DEBUG);

  }

void loop() { 
  // Verifica se o ESP8266 esta enviando dados
  Serial.println("Aguardando solicitacao ...");  
  if (esp8266.available())
  {

    if (esp8266.find("+IPD,"))
    {
      delay(300);
      int connectionId = esp8266.read() - 48;
 
      String webpage = "<head><meta http-equiv=""refresh"" content=""3"">";
      webpage += "</head><h1><u>ESP8266 - Web Server</u></h1><h2>Porta";
      webpage += "Digital 8: ";
      int a = digitalRead(8);
      webpage += a;
      webpage += "<h2>Porta Digital 9: ";
      int b = digitalRead(9);
      webpage += b;
      webpage += "</h2>";
 
      String cipSend = "AT+CIPSEND=";
      cipSend += connectionId;
      cipSend += ",";
      cipSend += webpage.length();
      cipSend += "\r\n";
 
      sendData(cipSend, 1000, DEBUG);
      sendData(webpage, 1000, DEBUG);
 
      String closeCommand = "AT+CIPCLOSE=";
      closeCommand += connectionId; // append connection id
      closeCommand += "\r\n";
 
      sendData(closeCommand, 3000, DEBUG);
    }
  }
}

String sendData(String command, const int timeout, boolean debug)
{
  // Envio dos comandos AT para o modulo
  String response = "";
  esp8266.print(command);
  long int time = millis();
  while ( (time + timeout) > millis())
  {
    while (esp8266.available())
    {
      // The esp has data so display its output to the serial window
      char c = esp8266.read(); // read the next character.
      response += c;
    }
  }
  if (debug)
  {
    Serial.println(response);
  }
  return response;
}